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Article: Postprandial kinetics of dietary amino acids are the main determinant of their metabolism after soy or milk protein ingestion in humans1
- Article from:
- The Journal of Nutrition
- Article date:
- May 1, 2003
- Author:
CopyrightCopyright American Institute of Nutrition May 2003. Provided by ProQuest LLC. (Hide copyright information)
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ABSTRACT Soy proteins have been shown to result in lower postprandial nitrogen retention than milk proteins, but the mechanisms underlying these differences have not been elucidated. To investigate this question, we measured the postprandial kinetics of the appearance of individual ^sup 15^N-amino acids in the serum of healthy adults after the ingestion of either ^sup 15^N-soy (n = 8) or ^sup 15^N-milk proteins (n = 8) in a mixed single meal (46 kJ/kg). The kinetics of total and dietary amino acids (AA) in the peripheral circulation were characterized by an earlier and higher peak after soy protein ingestion. Dietary AA levels peaked at 2.5 h in the soy group vs. 3.9 h in the milk group (P ...